(a) How much heat transfer (in kJ) is necessary to raise the temperature of a 0.
ID: 306824 • Letter: #
Question
(a) How much heat transfer (in kJ) is necessary to raise the temperature of a 0.190 kg piece of ice from ?16.0°C to 132°C, including the energy needed for phase changes? (Assume the substance remains at a constant volume throughout each stage of the heating process.) kJ (b) How much time (in s) is required for each stage, assuming a constant 18.5 kJ/s rate of heat transfer? (Enter your answers as a comma-separated list. Enter your times in order from the earliest stage to the final stage of the heating process.) t = s
Explanation / Answer
(A) to raise the temp.
Q = m C deltaT
and to change the state at temp
Q = m L
Q = (0.190 x 2.108 x 16) + (0.190 x 334) + (0.190 x 4.186 x (100-0)) + (0.190 x 2230) + (0.190 x 1.966 x (132-100))
Q = 585 kJ ....Ans
(B) Q = P t
585 = (18.5 ) t
t = 31.6 sec
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